* {
    margin: 0;
    padding: 0;
}
body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(200deg, #80d0c7, #13547a);
}

.btn-box {
    width: 500px;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-around;
    button {
        position: relative;
        border: none;
        background: linear-gradient(to right, #52d1c2, #1ab3a1);
        width: 200px;
        height: 60px;
        margin: 20px 0;
        font-size: 18px;
        color: #fff;
        letter-spacing: 3px;
        border-radius: 30px;
        box-shadow: 3px 5px 10px rgba(0, 0, 0, 0.1);
        overflow: hidden;
        cursor: pointer;
        &:hover {
            box-shadow: 3px 5px 10px rgba(0, 0, 0, 0.2);
        }
        span {
            position: absolute;
            width: 30px;
            height: 30px;
            background-color: #fff;
            border-radius: 50%;
            transform: translate(-50%, -50%);
            pointer-events: none;
            animation: animate 1s ease;
        }
    }
}

@keyframes animate {
    from {
        width: 0%;
        height: 0;
        opacity: 0.5;
    }
    to {
        width: 400px;
        height: 400px;
        opacity: 0;
    }
}
